Final answer:
The type of image formed by a lens with m = -4.6 is one that is smaller than the object and virtual.
Step-by-step explanation:
The type of image formed by a lens with a magnification (m) of -4.6 is option B: One that is smaller than the object and virtual.
When the magnification value is negative, it indicates that the image is smaller than the object. Additionally, a negative magnification value indicates that the image is formed on the same side of the lens as the object, which means it is a virtual image. Therefore, an image formed by a lens with m = -4.6 is smaller than the object and virtual.